What is about relatives which sending 10-50 merit to each other?
From what I've seen, most of the transactions sending 10-50 Merit at once are not for good posts anyway.Do as theymos recommended: don't waste sleep over it, in the end it will be a small fraction of total Merit. Remember: We're destroying more merits than we're sending. Like, way more., give it time and the spammers run out of sMerit.
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Is it OK to participate in polls with your alt? 
Make a poll And there's this:
I think that tagging may be appropriate in particularly obvious cases, or particularly egregious cases involving hundreds of merit points and several posts. But generally you should start out by assuming good faith, and only change that opinion as the evidence really piles up.
This isn't easy 